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英语语法问题They have a definite meaning,for they were as near as

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英语语法问题
They have a definite meaning,for they were as near as early man could get to writing这句话后面for引导的从句中为什么出现了were 和could get ,主系表和主谓宾两种结构?如果could get to writing是修饰early man ,为什么要加could?如果不是帮我分析一下后面从句的成分.请详细回答,
请你确定句子是不是写正确了.我找到的原句是:
They【 had】 a definite meaning,for they were as near as early man could get to writting.
这些场面含有明确的意义,因为这已经接近原始人的书写阶段.
前面是had 这样就可以解释后面的were了
后面用could是情态动词,表示的是过去的一种能力,表示能够
后面是一个句型
as+形容词+as+句子
前面的as是介词 后面的as是连词